mkdir lecture1
cd lecture1
for k in A B C
do
	for i in ${1..100}
		do
		touch $k$i.txt
	done
done
$L=0
while [[ $RANDOM -lt 20 ]]
do
	$L=$L+1		
	mkdir dir$L
done
for m in ${ls}
do
	echo $RANDOM > $m
done
